Error: Could not load file or assembly Blackbaud.AppFx.XmlTypes, Version=2.9.1001.4, Culture=neutral, PublicKeyToken=null or one of its dependencies. Access is denied. - when performing functions in NetCommunity

After sending out an email message, the message report shows an exception:Alternatively, you may be processing transactions in the NetCommunity plugin and receive the following error:

Could not load file or assembly 'Blackbaud.AppFx.XmlTypes, Version=2.9.1001.4, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Access is denied.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.IO.FileLoadException: Could not load file or assembly 'Blackbaud.AppFx.XmlTypes, Version=2.9.1001.4, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Access is denied.

This error is also seen on the testconfig page under Blackbaud Enterprise Ping.

If NetCommunity is on version 7.0 and below, review [netcommunityURL]/testconfig.aspx

If your NetCommunity is hosted, Click Chat with Support and reference this article

If your NetCommunity is hosted by your organization, Please contact the appropriate software vendor or IT professional for assistance with this process or issue which is beyond Blackbaud's scope of support. You may recommend they recycle app pools.